Speaker
Description
The Future Circular Collider (FCC) represents CERN’s flagship future project. Following the Feasibility Study Report published in 2025 and the Reference Design Phase (RDP) concluding at the end of 2027, the project faces unprecedented engineering challenges. The proposed 91 km tunnel requires the high-precision alignment of approximately 23 000 magnets, pushing existing geodetic and metrological techniques, including those currently validated by the Large Hadron Collider, to their limits regarding tolerance and scalability. This contribution introduces the FCC-ee project with current alignment requirements and addresses three key surveying challenges: extending the surface geodetic reference network to cover the FCC site; refining fiducialisation procedures; and optimizing data analysis methodologies. We provide an overview of the critical steps in the alignment process for large-scale accelerators and discuss the associated survey aspects. Furthermore, we highlight ongoing preparatory efforts currently under investigation within the RDP framework, aimed at validating solutions to meet the FCC's positioning requirements.
